One of the most prevalent theories surrounding Jon's death/survival/resurrection is that he wargs into his direwolf, Ghost, before he actually dies, and thus while his body is killed is mind and spirit is not. It's not an unreasonable expectation, especially where Thrones fan theories are concerned, because the idea of warging has already been established, so it wouldn't be too much of a stretch to have Jon do it into Ghost here. What this does mean is that we may actually get to spend some time with Jon as a direwolf, before he's able to come back properly. If Season 6 starts and he's inside Ghost, it'd be fun to watch things from that point of view, while also teasing fans about his return a little while longer, and also mean that they could use the warging much more going forward.